Portion Pak chips & cheese cups eliminate waste and clean up and reduce inventory problems. Portion control gives you exact cost per serving. Cheese cups are not microwavable but are designed to be heated in Portion Pak cheese warmers which come in various sizes. The medium sized unit featured here is 12 ½” wide x 15 ½” deep x 23″ high, 120 volts, 500 watts. It holds 80 cheese cups.